Delimitation for reduction of the dust emissions for a cooler for cooling hot bulk material

Abstract

A cooler (1) for cooling hot bulk goods (17) preferably iron ore sinter: The cooler has a grate surface (16) for holding the hot bulk goods (17) to be treated to reduce the dust emissions and at the same time to also enable maintenance measures on the cooler (1). Covers are located in the region of the feed point (2) and the removal point (3). The device herein provides an additional boundary, which prevents the removal of dust particles of size over 150 m. The boundary is a stationary first wall (12) and a stationary second wall (11) and the boundary extends over a partial segment, and preferably over the entire region, of the uncovered grate surface (16). A supporting structure (18) is provided, to which the first wall (11) and the second wall (12) are fastened.

Claims

1. A cooler for cooling hot bulk material, comprising: a grate surface configured for supporting the hot bulk material for treatment; a first cooler wall and an opposing second cooler wall spaced apart to delimit the grate surface between the first and second cooler walls; a feeding-in point for feeding the hot bulk material to the grate surface; a first region that extends over between 20% and 30% of the grate surface, wherein the first region comprises the feeding-in point; a positionally fixed first cover over the first region; a second region that is upwardly open and is situated between the first region and a third region; an extraction point for the cooled bulk material; the third region that extends over at least 10% to 20% of the grate surface, wherein the third region comprises the extraction point; a positionally fixed third cover over the third region; a delimitation at the second region comprised of a positionally fixed first wall that comprises a plurality of individual segments, and a positionally fixed second wall comprising a plurality of individual segments and spaced from the positionally fixed first wall, and the delimitation extends at least over a partial section of the second region; a supporting structure on which the positionally fixed first wall and the positionally fixed second wall are suspended, the positionally fixed first wall lies on the first cooler wall or is separated from the first cooler wall by a gap, and the positionally fixed second wall lies on the second cooler wall or is separated from the second cooler wall by a gap; and the delimitation additionally has a perforated plate comprising a plurality of individual segments situated between the positionally fixed first wall and the positionally fixed second wall.

2. The cooler as claimed in claim 1, wherein the delimitation has a height, measured between a top edge of the bulk material at the grate surface and a top edge of the positionally fixed first wall or a top edge of the positionally fixed second wall, of at least 1 m.

3. The cooler as claimed in claim 1, further comprising: a transition from the first cooler wall to the first wall, and a respective temperature-resistant seal is fitted at the transition from the first cooler wall to the first wall; a transition from the second cooler wall to the second wall, and a respective temperature resistant seal is fitted at the transition from the second cooler wall to the second wall.

4. The cooler as claimed in claim 1, wherein the perforated plate has perforations occupying up to 70% of a total area of the perforated plate.

5. The cooler as claimed in claim 1, wherein the perforated plate is formed from expanded metal.

6. The cooler as claimed in claim 1, wherein the cooler is in the form of a ring-shaped cooler.

7. The cooler as claimed in claim 6, wherein the individual segments of the ring-shaped cooler extend over an angle of the ring shape in the range of 10 to 20.

8. The cooler as claimed in claim 1, wherein the delimitation has a height, measured between a top edge of the bulk material and a top edge of the positionally fixed first wall or of the positionally fixed second wall of at least 1.5 m.

9. The cooler as claimed in claim 1, wherein the delimitation has a height, measured between a top edge of the bulk material and a top edge of the positionally fixed first wall or of the positionally fixed second wall of at least 2.0 m.

10. The cooler as claimed in claim 1, wherein the perforated plate has perforations occupying up to 60% of a total area of the perforated plate.

11. The cooler as claimed in claim 1, wherein the perforated plate has perforations occupying up to 50% of a total area of the perforated plate.

12. The cooler as claimed in claim 1, wherein the cooler is in the form of a straight path cooler.

13. The cooler as claimed in claim 2, wherein the perforated plate is at a height which is to be above the top edge of the bulk material at the grate surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will be described by way of example below on the basis of schematic Figures, in which:

(2) FIG. 1 is a schematic illustration of a ring-shaped cooler according to the prior art,

(3) FIG. 2 is a schematic illustration of a straight cooler according to the prior art,

(4) FIG. 3 is a schematic illustration of a cooler according to the invention,

(5) FIG. 4 shows an advantageous design variant of a cooler according to the invention,

(6) FIG. 5 shows an advantageous design variant of a ring-shaped cooler according to the invention, and

(7) FIG. 6 is a schematic illustration of a straight cooler according to the invention.

DESCRIPTION OF PRIOR ART EMBODIMENTS

(8) FIG. 1 shows a plan view of a ring-shaped cooler 1. It has a feeding-in point 2, which is situated in a first region 4. It has a cover 7 situated over the first region 4. The first region 4 encompasses a region denoted by the angle .sub.1. The first region 4 is followed in the direction of rotation, which is indicated by the arrow, by a second region 5. The second region 5 does not have a cover. The ring-shaped cooler 1 has a grate surface 16 which is delimited by a first radially inward cooler wall 10 and by a second radially outward cooler wall 9. The second region can accommodate hot bulk material. The size of the second region 5 is indicated by the angle .sub.2.

(9) A third region 6 is situated between the other two regions 4 and 5. The discharge point 3 and a third cover 8 are also situated in the third region 6. The size of the third region 6 is indicated by the angle .sub.3. In the case of a ring-shaped cooler, the first cooler wall 10 corresponds to a cooler inner wall, and the second cooler wall 9 corresponds to a cooler outer wall.

(10) FIG. 2 shows a side view of a straight cooler 1. A feeding-in point 2 is situated in a first region 4, and a cover 7 is situated over the first region 4. The first region 4 is followed in the direction of movement, indicated by the arrow, by a second region 5. The second region 5 does not have a cover. The straight cooler 1 has a grate surface 16 which is delimited by a first cooler wall 10 and by a second cooler wall 9 and which can accommodate hot bulk material. A third region 6 follows the second region 5 in an adjoining manner. The discharge point 3 and a third cover 8 are also situated in the third region 6.

DESCRIPTION OF EMBODIMENTS

(11) FIG. 3 illustrates an embodiment according to the invention of the device for reducing the dust emissions in a ring-shaped cooler.

(12) The hot bulk material 17 is situated on the grate surface 16. That surface is delimited by the second cooler wall 9 and the first cooler wall 10. A second wall 11 is situated on the second cooler wall 9, and a first wall 12 is situated on the first cooler wall 10. Cooling air 15 is blown through the grate surface 16 and through the hot bulk material 17 by action of a blower box 14. The cooling air 15a emerges at the surface of the bulk material 17, carrying along dust particles. The first wall 12 and the second wall 11 are fastened to a supporting structure 18, in order that the rotational movement of the ring-shaped cooler 1 not impeded by the weight of the first wall 12 and second wall 11, and in order that dismounting can be performed quickly. Dismounting the second wall 11 and the first wall 12 is necessary for maintenance of the ring-shaped cooler.

(13) FIG. 4 illustrates an advantageous design variant of a ring-shaped cooler according to the invention. That variant differs from FIG. 3 in that a perforated plate 19 is installed between the second wall 11 and the first wall 12. Furthermore, a temperature-resistant seal 13, 13a is arranged at the transition between the first cooler wall 10 and the first wall 12 and between the second cooler wall 9 and second wall 11. The seal 13, 13a prevents dust particles from escaping from the cooler via that transition path. The reference designations not mentioned here have been described with regard to FIG. 3.

(14) FIG. 5 a further advantageous embodiment of the ring-shaped cooler according to the invention, in which the first wall 12a and the second wall 11a are comprised of individual segments. The annular sizes of the individual segments are indicated by the angle . In this embodiment, all of the segments may be of equal size. The segments of the second wall 11a and of the first wall 12a are each suspended on the supporting structure 18. In this Figure, a supporting structure is illustrated only for one segment. A segment is comprised in each case of a first wall 12a, a second wall 11a and, if one is provided, a perforated plate. The perforated plate has not been illustrated in this Figure in order to provide a clearer illustration. The reference designations not mentioned here have already been described with regard to FIG. 3.

(15) FIG. 6 shows a side view of an advantageous embodiment of a straight cooler 1 according to the invention. Here, the first wall 12a-c is arranged on the first cooler wall 10 and the second wall 11a-c is arranged on the second cooler wall 9. The first wall 12a-c and the second wall 11a-c are suspended from the supporting structure 18, and a perforated plate 19a-c is also fitted. In this illustration, the division into segments of the first wall 12a, 12b and 12c, of the second wall 11a, 11b and 11c and of the perforated plate 19a, 19b and 19c can be seen. It is thus always possible to remove specifically those parts, that is the three segments that have to be removed in order to be able to perform maintenance operations. The reference designations not mentioned here have already been described with regard to FIG. 3.

(16) Even though the invention has been illustrated and described in more detail on the basis of the preferred exemplary embodiments, the invention is not restricted to the disclosed examples, and other variations may be derived from these by a person skilled in the art, without departing from the scope of protection of the invention.

LIST OF REFERENCE DESIGNATIONS

(17) 1 Cooler 2 Feeding-in point 3 Extraction point 4 First region 5 Second region 6 Third region 7 First cover 8 Third cover 9 Second cooler wall 10 First cooler wall 11, 11a-c Second wall 12, 12a-c First wall 13, 13a Seal 14 Blower box 15 Cooling gas entering the grate surface 15a Cooling gas exiting the bulk material 16 Grate surface 17 Bulk material 18 Supporting structure 19, 19a-c Perforated plate .sub.1 Angle of first region .sub.2 Angle of second region .sub.3 Angle of third region Size of the segments